Abstract

A substrate removal technique using an InAsSb etch stop layer improves by a factor of 2 the quantum efficiency of back side illuminated type-II superlatticephotodetectors. After etching of the GaSb substrate with a based solution, the quantum efficiency of the diodes presents Fabry-Pérot oscillations averaging at 56%. Due to the confinement of the infrared light inside the devices, the quantum efficiency for certain devices reaches 75% at . The implementation of this new technique to a focal plane array resulted in a decrease of the integration time from .